问题
I made an RShiny app with a lengthy computation.
The lengthy computation leaves the screen at a standstill, and I am worried that either the computation came up blank, or that the connection timed out, or something else might have happened.
Is there a way to show an indicator (ie rotating hour glass, etc) on the screen to show the user that processing is ongoing.
回答1:
You could add a progress bar. http://shiny.rstudio.com/reference/shiny/1.2.0/Progress.html.
This might take a bit of refactoring, but it improves the UX and would give you an idea of where the failure is occurring(Connection, computation, etc.).
来源：https://stackoverflow.com/questions/53852969/rshiny-computation-progress-indicator